Captioned telephone service

ABSTRACT

Captioned telephone are devices intended to provide text captions to persons needing assistance with telephone communications. Captioned telephones provide text by using the services of a relay interposed between the assisted user and the hearing user, the relay providing the captioning for the assisted user. While captioned telephone service can be delivered over a single telephone line, if the assisted user has two telephone lines available for the captioning service, additional features and advantages are possible in the delivery of captioned telephone service to the user.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from U.S. provisional patentapplication Ser. No. 60/545,519 filed Feb. 18, 2004.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

BACKGROUND OF THE INVENTION

Modern telecommunication systems include facilities to permit use oftelecommunication systems by those who are deaf or hard of hearing. Thebest known form of such communication makes use of devices known astelecommunication devices for the deaf (TDD), also known as texttelephones (TTY). TTY communication is widely used between deaf people.Hearing users communicate with deaf users who are users of TDD devicesthrough so-called “relays.” A relay is a telecommunication intermediaryservice, funded by telephone communication surcharges, which is intendedto permit deaf or hard of hearing people to utilize the normal telephonenetwork. At a relay, an operator referred to as a call assistantintermediates between a deaf user and a hearing person by communicatingwith the deaf person using a TDD and communicating with the hearingperson by voice over a normal telephone line.

Previous technology has enabled the relay system to be used to provide aform of enhanced telephone communication for people who are not deaf,but are hard of hearing. This approach to telecommunications isexemplified by U.S. Pat. Nos. 6,307,921 and 6,075,842, the disclosure ofwhich is incorporated by reference. These patents, entitled “TextEnhanced Telephony,” referred to a system that provides captionedtelephone service, a service currently marketed under the service markCaptel by Ultratec, Inc. and its licensees. A captioned telephone, ortelephone enabled to do text enhanced telephony, is capable of providinga text message to a user of the words which are transmitted to that userover a conventional telephone line. The captioned telephone userreceives normal voice from the party on the other end of the line, aswell as a text transcription of the words spoken by the other party, sothat the user may refer to the text for missed words in theconversation. This capability is made possible by automation in therelay which permits text or captioning to be delivered nearlysimultaneously with voice. In addition, the telephone station of theassisted user is specially configured to facilitate the set up ofcaptioned telephone calls.

In its original conception, the text assisted telephone system wasdesigned to be deliverable to and operated by a user over a singletelephone line to the user. As the costs of telephone service drops, itis now apparent that many users of captioned telephone service may electto use two telephone lines to take full advantage of the opportunity forimproved service that comes from text enhanced telephone. The concept ofusing two telephone lines to provide captioned telephone service ingeneral to an assisted user is disclosed in U.S. Pat. No. 6,603,835, thedisclosure of which is incorporated herein by reference.

BRIEF SUMMARY OF THE INVENTION

The present invention is summarized in a method of operating a captionedtelephone call in which an assisted user is connected by through acaptioned telephone device which is connected both to one telephone lineto a remote user and a second telephone line to a relay providingcaptioning for the conversation. The method includes the steps of whenthe assisted user initiates a call by dialing a telephone number on thefirst telephone line, the captioned telephone device storing thetelephone number without dialing immediately on the first telephoneline; the captioned telephone device initiating a call on the secondtelephone line to the relay to initiate captioning service set up; andthe captioned telephone device then dialing the stored telephone numberon the first telephone line.

It is an object of the present invention to provide a captionedtelephone service that is as automatic as it can be made in terms ofservices and options to the assisted user.

It is another object of the present invention to make a captionedtelephone service that, to the user, seems as close as possible toconventional telephone service for fully hearing users.

It is another object of the present invention to define a captionedtelephone system in which the relay call assistant does not have to hearthe voice of the assisted user.

Other objects, advantages and features of the present invention willbecome apparent from the following specification.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a schematic view of the arrangement of the parties in acaptioned telephone call system as described here.

FIG. 2 is a schematic diagram or a combined telephone and captionedtelephone device.

DETAILED DESCRIPTION OF THE INVENTION

Shown in FIG. 1 is a schematic view of the arrangement for a generalizedtwo line captioned telephone service. An assisted user is positioned touse a telephone 10. The user telephone is connected to a captionedtelephone device 12, which is interposed between the telephone 10 and afirst telephone line 14. As an alternative, the captioned telephonedevice 12 is preferably built into the same physical case as thetelephone 10, but these are shown in separate boxes in FIG. 1 forpurposed of clarity of illustration. The first telephone line 14connects to a remote telephone 16, which is the station of the caller orperson to whom the assisted user wishes to speak. The captionedtelephone device is also connected to a second telephone line 18, whichis connected at its other end to a relay, indicated at 20. The relay 20is preferably a relay of the type described in U.S. Pat. No. 6,233,314,among others, and currently commercially available under the nameCaptel™ relay, from CapTel, Inc.

In its general operation, the person at the remote telephone 16 wouldconverse normally with the assisted user at the telephone 10. At thecaptioned telephone device 12, the voice of the remote user is passedalong the second telephone line 18 to the relay 20. At the relay 20, thevoice carrying the spoken words of the remote user is converted into atext or digital massage stream that is passed back to the captionedtelephone device 12 over the same telephone line 18. The captionedtelephone device 12 displays the text of the digital message streamreceived from the relay 20, so that the assisted user can read the wordsspoken by the remote user. The captioned telephone device 12 isconstructed to not pass voice or digital signals from the relay onto thefirst telephone line, so that the digital communication tones from therelay do not distract or bother the users. If the assisted user can hearand understand the words spoken by the remote user, the assisted usercan respond normally. If the assisted user has difficulty in hearing orunderstanding any words spoken by the remote user, those words aredisplayed for the assisted user by the captioned telephone device sothat the assisted user can read the words. Thus the service isunobtrusive and available as needed to help the assisted user.

In the preferred embodiment of the captioned telephone device 12, thecaptioned telephone device 12 and the telephone 10 are combined in asingle device. Shown in FIG. 2 is a captioned telephone device 100 whichembodies that combination. This device is also intended to support acommunication, command and signaling protocol known as UVT to facilitatecaptioned call, as is described in more detail in U.S. Pat. No.6,504,910, which is hereby incorporated by reference. In FIG. 2 theinterior components of the captioned telephone device 100 areillustrated in block diagrams indicating the digital logic componentsfrom which the device may be constructed. It is preferred, however, thatthe components within the dotted lines in FIG. 2, labeled as DSPsoftware, actually be implemented in the form of a software routineoperating a digital signal processing integrated circuit to perform thefunctions of the illustrated blocks. In the captioned telephone device100, the telephonic connection to the relay, i.e. the connection to thesecond telephone line 18, is indicated at 102. The input telephonicsignal connects to a DAA and hybrid 104 and then to a codec 106 todigitize input signals. Following the codec 106 is a modem 108, theoutput of which connects to a UVT formatter 110. The UVT formatter 110formats the digitized voice signals from the first telephone line fortransmission to the relay service and to decode the digital text signalsreceived. The digitized text signals are transferred from the UVTformatter 110 to a visually readable display 112 on which the text canbe displayed for the assisted user. Voice signals from the firsttelephone line 14, indicated here as 121, are converted to digitalsignals by a codec 118. An echo control circuit 116 is used to removethe voice of the assisted user at a handset 120 from the voices of theother party. The output of the echo control 116 is sent to a vocoder 114for compression, in this case, using G.729 protocols. The voice ispassed to the UVT formatter 110 and on to a modem 108 for transmissionto the relay center over the telephone line 102. In summary, theassisted station passes the voice from the first telephone line 121 tothe speaker in the handset for the assisted user and also compresses thevoice for transmission to the relay service over the telephone line 102.At the same time, it decodes the digital text stream and presents thetext stream as a visual text message to the user on the display 112. Theassisted user thus receives both the voice of the hearing user from thefirst telephone line and is provided a text display of the words spokenby the hearing user from the digital test sent over the second telephoneline.

In general, the specification below describes only the differences inthe operation of an captioned telephone service between that logicallyconfigured as shown in FIG. 1 and a similar captioned telephone deviceoperating an a single telephone line. However, it should be understoodthat the physical embodiment of the devices and the telephone lines issubject to much variation. For example, while plain, unfeatured,land-line “plain old telephone services” are illustrated in FIG. 1, thetelephone lines or connections themselves may be any of the more modernwired or wireless telephones available today. The captioned telephonedevice is, for example, preferably built in the same device as thetelephone 12, as illustrated in FIG. 2. Similarly, the telephone lines14 and 18 can be simple land-line two-wire telephone lines, but theycould also be any other form of modern telephone interconnection,including cellular connections, PCS connections, or even dataconnections such as internet protocol (IP) connected across the internetor other data connection service. While two single telephone connectionscan be used for this function it is also understood that a single IPphysical connection can serve as the two separate connections. Thus theterm telephone line or telephone connection as used in this document isintended to be used to describe a voice capable interconnection betweentwo remote telephone devices rather than being restricted to a physicalpair of wires. In any event, as will be seen from the followingdescription, a number of features of addition functionality are possibleusing a two-line captioned telephone connection that have not beenpreviously contemplated. Several of such features are discussed and thefeatures can be implemented as a group or individually.

Dial Delay

Assume that the party initiating the call session is the assisted userat the telephone 10. Assume as well that the assisted user wants thedefault configuration to be that his or her calls are a text assisted,or are captioned. The user picks up the handset of the telephone 10 anddials as normal the telephone number of the remote user. However, if theremote user was dialed immediately, there is a chance that thecaptioning service would not be ready to go at the time the remote useranswers his or her telephone 16. So the captioned telephone device 12 atthe station of the assisted user is programmed to intercept the dialingof the remote user and to instead first dial the relay 20 on telephoneline 18. Typically, in the simplest embodiment, the captioned telephonedevice could simply store DTMF tones for the number dialed by theassisted user. When the relay 20 is engaged and ready to function, acommand is sent over the telephone line 18 to the captioned telephonedevice 12 to initiate the call to the remote user. The captionedtelephone device 12 then calls the telephone 14 of the remote user toinitiate the call, as by placing the DTMF tones for the on the firsttelephone line 12 to make the call.

Using this concept of intercepting and storing the number called by theassisted user, the captioning function provided by the relay 20 isavailable from the start of the call. If, for example, the call does notgo through properly, and a message is received from the telephonenetwork, such as “all circuits are busy now, please try again later,”that message can be transmitted in text to the assisted user. If theassisted is so hearing impaired that the ringing or answering of theremote telephone cannot be understood, text messages from the relay cansupply the needed information.

Again while the simplest embodiment of this feature is the interceptionof the DTMF tones, and the storage of those tones for later uses, thefunctional equivalent of that technique for other forms of telephoneinterconnection are also envisioned. If, for example, the telephoneconnection is actually through IP access over the internet, thecaptioned telephone device 12 could store the uniform resource address(URL) for the remote user, connect to the relay 20 by internet access orconventional telephone connection, and then implement the connection tothe remote user to complete the call. Another alternative as to theimplementation of this feature is to use a fixed time delay for dialingthe remote station instead of waiting for an acknowledgement fromthe-relay. A fixed time delay of a few seconds would normally sufficefor the relay to be connected and up and running.

One safety detail is required to properly implement this feature. If thenumber dialed by the assisted user is “911” or other emergencyassistance number, then the dial should not be delayed at all, and thedialing information should be immediately presented to the telephonenetwork. Emergency service facilities, such as the various 911 servicesin the United States, are normally equipped with the capability toreceive and communicate with hearing impaired callers directly, withoutthe need for an intermediate relay. In addition, it is desirable thatthe response time for receipt and handling of the emergency servicescall not be impacted by other factors such as a potential busy time forservice usage at the relay. Hence it is preferred that the captionedtelephone device 12, whether it is a separate box or a part of theassisted user's telephone, scan the numbers dialed by the assisted userand immediately pass along any call to the local emergency servicesnumber regardless of the user's preferences about relay assistance innormal calls. In addition, when dialing 9-1-1 is detected, the captionedtelephone device 12 can be equipped to have a second DTMF number orother method of connecting to the relay 20 which has priority over othercalls such that the user dialing 9-1-1 is routed to the relay 20 andgiven captioning service in the minimum possible time delay.

Line Testing

A feature that modern telephone equipment makes possible is line testingto see if a telephone line is “on-hook” (meaning unused) or “off-hook”(meaning that the line is in use) This feature or capability tests thetelephone line to which it is connected, and returns a signal of in use,not in use, or ringing. For two-line captioned telephone service, theability to test line conditions permits condition responsive actuationof variations of the captioned telephone service.

For example, assume that the telephone 10 of the assisted user is not inuse, but set up to answer and automatically initiate captioning by acall on the second telephone line 18 to the relay 20. Then when a callis received by the telephone 10, it can test the condition of the secondtelephone line 18 before responding. If the telephone line 18 isavailable, the assisted users' station can initiate the call to therelay to secure captioning service even before answering the incomingcall on the first telephone line. If the second telephone line is busy,then station can inform the user and give the assisted user the optionto capture the number of the caller using Caller-ID, and then call thatsame party right back using single line captioned service using only thefirst telephone line. The assisted user could also wait until the secondline clears and then initiate a two-line captioned call.

Automated Mode Choice

As describe above, the captioned telephone device can sense the statusof the telephone lines as to whether they are in use of not. In mostcases, the device will use the same line, here telephone line 14, toconnect to the remote caller, and a second telephone line 18 to connectto the relay. In this configuration, the assisted user would generallygive out the telephone number of the first telephone line 14 as theirtelephone number. If an incoming call is received by the station of theassisted user, while the telephone is ringing, the captioned telephonedevice 12 checks the status of the second telephone line 18. If thesecond telephone line 18 is available, the normal implementation oftwo-line captioning can proceed. If the second telephone line is in use,the device then displays for the assisted user a message such as “Line 2is in use, no captions available,” or other warning about the status ofcaptioning. The assisted user can then decide if he or she wishes toanswer the line and conduct the telephone call without captioning. Sincethe captioned telephone device preferably includes built-in Caller IDfunctionality, the assisted user can evaluate the availability for2-line captioning service before picking up the telephone to answer thecall.

The same information is, of course, available when the assisted user isthe person doing the dialing. The assisted user dials a number, with thecaptioned telephone device set up to normally invoke captioning from therelay over the second telephone line 18. The captioned telephone device12 senses, however, that the second line 18 is busy, and thereforeprovides a message to the assisted user such as “Line 2 not available,Use 1 line captioning?” If the assisted user elects to proceed with1-line captioning, as by pressing a key on the captioned telephonedevice, the captioned telephone device would first call the relay 20 andpass to the relay command information so as to set the call up as asingle line captioned call. In that mode, the relay is interposedbetween the assisted and remote callers, as described in U.S. Pat. No.5,724,405. If the assisted user does not wish to proceed with singleline captioning, the assisted user can simply hang up and try againlater when the second line might be available.

Automated Line Selection

As described above, the captioned telephone device can detect the statusof the two telephone lines, and use that information in the set up ofthe captioned telephone call. The assisted user will normally have thefirst telephone line 14 set up to be the primary telephone line. In thisconfiguration, the first line 14 would normally be the line on which theassisted user places and receives calls. However, the captionedtelephone device 12 will also detect an incoming ring on the secondtelephone line 18 and signal to the assisted user that an incoming callis being detected. Such a signal may need to be a visual signal (such asdisplaying a message such as “Ring on Line 2” for users who cannot hearat all, while for a hearing user the signal for an incoming call on thesecond line can be a ringing tone different from that tone used with thefirst telephone line 14. If the captioned telephone device has beenconfigured to set up a 2-line captioned telephone call, the device willthen dial the relay 20 over the first telephone line and reverse theusual configuration.

Automated Installation

As mentioned, the captioned telephone device 12 is provided with theability to sense the status of the two telephone lines to which it isconnected. This permits automated set up of the device duringinstallation. The user simply connects the telephone jacks to thestandard ports provided on the captioned telephone device. The softwarein the device will detect that a telephone line is connected andautomatically configure the software to use that telephone line as thefirst telephone line. If only one line is connected to the device, itstill automatically set itself up to support one-line captioning for anytelephone calls made. If the user has two telephone lines available, andthe lines are connected to the captioned telephone device, it willdetect that and will automatically configure itself to be able tosupport two-line captioning service. Used in this way, it is notmandatory that the assisted user actually designate either of the twotelephone lines as their first or second line. The captioned telephonedevice will automatically configure itself for the telephone line orlines available and may the best adaptation that it can to any incomingor outgoing call. The captioned telephone device does have thealternative to designate one of the lines as the primary line, if thatis needed for any reason.

Dial on Ring

When the assisted user receives a call using the captioned telephoneservice, the user answers the telephone just as they normally would, bypicking up the handset or actuating the speakerphone, if equipped withone. When the start of an incoming call is detected by the captionedtelephone device, it then checks the status of the control buttons onthe face of the device and, assuming the captioning is selected, thecaptioned telephone device immediately dials the number of the relay.Normally it will take anywhere from a few seconds to tens of secondsbefore the captioning service is set up though the relay, depending onhow busy the relay is at that moment. In most cases, the captioningservice can be configured in ten to fifteen seconds. Obviously, byinitiating the interconnection to the relay before the assisted usereven picks up the telephone, the time required to begin captioning thecall when it is answered is decreased. Note that since the largest costat the relay is the call assistant, the relay would not assign a callassistant to the call until both parties have picked up their phones andare on the line. In that way, the cost of attention by a call assistantto the call is avoided if the assisted user does not actually answer thecall.

Other strategies can be used to decrease the time for connection and setup. If an ISDN line is used for the second telephone line 18, the speedis increased since ISDN dialing is much faster than traditional DTMFdialing. However, since ISDN service is more expensive than traditionalplain residential telephone service, other options may be morecommercial acceptable to consumers. The captioning device can useInternet Protocol (IP) signaling to communicate with the relay servicecenter. This would allow direct digital or internet connections for thedelivery of the captions, i.e. the logical second telephone line 18would actually be an IP connection. Since broadband connection to theinternet, wired and unwired, is becoming increasingly common, thisalternative will be a preferred choice for many consumers.

End of Call

Another method for reducing set up time is to briefly hold theconnection to the relay, established over the second telephone line,after the assisted user ends the call on the first telephone line 14.This is to provide for the possibility that the caller is about to makeanother call. If the assisted user is about to make another call, thefact that the connection to the relay has been maintained shortens thetime necessary to set up the second call. When the assisted user beginsthe second call, the relay is already connected and captioning can beginimmediately. The holding period should be brief, i.e. 2 to 10 seconds.When the hold timer expires, the captioned telephone device 12 sends aUVT message to the relay indicating that a disconnect is in progress,and it hangs up on the telephone line to the relay. The receipt of theUVT disconnect message also signal to the captioning service that theencounter is finished for the creation of a billing record of the call.

Echo Cancellation

For single line captioned telephone service, echo cancellation is usedin the equipment of the relay for the captioned telephone service fortwo reasons. The first reason is the captioning system uses digitizedand compressed audio to transmit voice and the delays inherent in thisprocess would cause echo back to the user, were it not for the fact thatthe echo is not suppressed by the software. The second reason is toremove or cancel the voice of the assisted user from the audio receivedfrom the hearing party or the remote user. This is done so that the callassistant at the relay only hears the voice of the remote user that isto be captioned and is not confused by the voice of the assisted user.

When the captioning service is provided using two lines, echocancellation is still needed, but the arrangement of the echocancellation is significantly different. The echo cancellation now islocated in the captioned telephone device at the location of theassisted user. The echo cancellation circuitry or function acts toseparate the local voice of the assisted user from any other voices onthe first telephone line 14 as presented to the call assistant. In the2-line arrangement, this echo cancellation at the captioned telephonedevice provides the same benefit to the call assistant at the relay. Theecho cancellation is located between the first telephone lines 14 andthe handset microphone of the assisted user, so that the secondtelephone line 18 does not transmit to the relay any of the voice of theassisted user at telephone 10 to the relay. Thus the call assistant atthe relay 20 is not exposed to the voice of the assisted user. Thismakes the job of the call assistant easier, since the call assistantcaptions the voice he or she hears.

The arrangement provides a subsidiary benefit in that it permits othermembers of the household to also participate in the call, by picking upan extension telephone and joining in the conversation. The voice orvoices of the other people on the line are also sent to the relay forcaptioning. Only the voice of the assisted user, at the station of thecaptioned telephone device 12, is subjected to the echo cancellation. Sothe assisted user also gains the benefit of captioning of the othervoices in the conversation. For single line captioning service,participation by other members of the household is normally not possiblebecause the telephone communication to the house is in the form of adata stream carrying voice and text and is not a voice connection.

Billing Information Transmittal

For traditional TTY relay calls and for single-line captioning servicecalls, the relay uses the automatic number identification (ANI), orcalling party number (CPN), of the assisted user and the dialed numberof the remote user to determine who will be billed for the relay serviceperformed. In the U.S., and some other countries, relay service isusually paid for by third party payer, funded by governmental mandate toprovide telephone communication for the hearing impaired at the samecost as that available to the hearing. Typically in the U.S., calls thatare dialed back to the same state as the originating caller (intrastatecalls) are paid for by the state of the two parties to the conversation.Note that the relay may or may not be in the state in which the twoparties connect for a conversation. The cost of the relay services forcalls that cross a state boundary (interstate calls) are paid for by theNational Exchange Carriers Association (NECA). NECA maintains a systemof sharing costs and revenue for interstate telephone traffic thatcrosses state regulatory boundaries. The state agencies and NECA sharethe costs for toll free calls by an assisted user.

For two-line captioning service, the assisted user dials the other partydirectly. Hence, the relay is no longer in the middle of the call,between the parties. Therefore, it is not inherently apparent to therelay whether the call is interstate or intrastate. So the captionedtelephone device is programmed to keep a record of the telephone numberdialed by the assisted user and to report this number to the relay as apart of the set up of the captioning service for the call. A UVT commandis used to send the dialing information to the relay for capture andassociation with the billing records for the call. This informationtransmission allows the relay service providing the captioning todetermine the appropriate billing type for calls dialed by the assisteduser. Similarly, if caller ID information is received and captured as apart of an incoming call, the information can also be transmitted to therelay in a similar format to inform the relay of the category of thecall.

Call Answering Service

With two-line captioned telephone service, it is readily possible to addautomated message answering service as an added feature. When one of thetelephone lines rings with an incoming call, the software of thecaptioned telephone device, configured for automatic answering, waitsfor a predetermined number of rings and then answers the line. Thecaptioned telephone device meanwhile connects to the relay over theother telephone line. The captioned telephone device then plays apre-recorded message typical of telephone answering machines for thebenefit of the caller. The calling party responds by leaving a voicemessage, which is transmitted to the captioning relay 20 fortranscription into a text message. The captioned telephone device canalso capture the voice or the telephone number of the calling party. Thetranscription of the message is transmitted by the relay to thecaptioned telephone device and is stored as well as a text message. Whenthe assisted user returns, the text message is stored in memory of thecaptioned telephone device 12 and the voice message and/or number of thecalling party can be stored as well.

When the assisted user returns, he or she lifts the handset of thetelephone and presses a button on the captioned telephone device (or thecombined device if the telephone is a part of the device). The captionedtelephone device is programmed to display the text message on itsdisplay and, if desired, play back the voice message and/or telephonenumber of the calling party. The message storage, either voice or textor both, could also take place at the relay, and if this alternative isimplemented, when the user returns and asks for messages, the relaywould be called and the-stored-message downloaded. Note that the callassistant is not required for this message playback service and hencethe cost would not be large.

Selection of Service by Call Type

In its normal mode of operation, the captioned telephone deviceautomatically dials to the captioning relay 20, using a pre-configuredtelephone number (or IP address) for the relay. The assisted usernormally will not need to know or to dial the relay number to controlthis function. However, it is a useful variant that the captioningdevice be configured to dial different numbers depending on the typeand/or the number that the assisted user dials. For example, as statedearlier, if the assisted user dials an emergency assistance number, suchas 911, the software for the captioned telephone device can beprogrammed to dial a specific priority access number into the emergencyresponse system. Other specific functions or calls that use this featureinclude captioning in other languages, retrieving messages from thecaptioned relay service, installing updates to the software for thecaptioned telephone device, and 900 calls. 900 calls are calls whichauthorize additional costs to the caller for a service offered by the900 number and therefor 900 calls cost more than normal telephone calls.As a result, many telephone system users elect to disable theirtelephones from calling 900 numbers.

Normally the captioned telephone user will access the captioning relayby means of toll-free number (800 numbers in the U.S.). If the assistedcall requests the relay to dial a 900 number, the 900 number block atthe station of the user is avoided. Normally, an outside service, suchas the relay, cannot determine if 900 number access is blocked for theuser's telephone. To avoid this issue, the captioned telephone devicecould test the telephone numbers it handles, and be programmed to notpass along to the relay any 900 or other objectionable numbers.

1. A method of operating a captioned telephone call in which an assisteduser is connected by through a captioned telephone device which isconnected both to one telephone line to a remote user and a secondtelephone line to a relay providing captioning for the conversation, themethod comprising the steps of when the assisted user initiates a callby dialing a telephone number on the first telephone line, the captionedtelephone device storing the telephone number without dialingimmediately on the first telephone line; the captioned telephone deviceinitiating a call on the second telephone line to the relay to initiatecaptioning service set up, and thereafter passing the spoken wordsreceived on the first telephone line to the second telephone line; andthe captioned telephone device then dialing the stored telephone numberon the first telephone line to initiate a spoken conversation; and thecaptioning service them providing captioning to the captioned telephonedevice of the spoken words transmitted on the second telephone line. 2.A method as claimed in claim 1 wherein the telephone lines are each atelephonic connection selected from the group consisting of a twistedpair telephone land line, a cellular telephone link, a PCS link, and aninternet protocol (IP) connection.
 3. A method as claimed in claim 1wherein the captioned telephone device and the telephone of the assistedunit are built into a single device.
 4. A method as claimed in claim 1wherein the captioned telephone device examines the number dialed by theuser and immediately dials the number dialed by the assisted user if theassisted user has dialed an emergency services number.
 5. A method ofoperating a captioned telephone call in which an assisted user isconnected by through a captioned telephone device which is connectedboth to one telephone line to a remote user and a second telephone lineto a relay providing captioning for the conversation, the methodcomprising the steps of the captioned telephone device monitoring thestatus of both of the telephone lines; if a call is received by thecaptioned telephone device, and the other telephone line is not in use,the captioned telephone device setting up the call as a two-linecaptioned telephone call; and if a call is received by the captionedtelephone device, and the other telephone line is in use, the captionedtelephone device setting up the call as a single-line captionedtelephone call.
 6. A method of operating a captioned telephone call inwhich an assisted user is connected by through a captioned telephonedevice which is connected both to one telephone line to a remote userand a second telephone line to a relay providing captioning for theconversation, the method comprising the steps of when an incoming callis initiated on the first telephone line, the captioned telephone lineimmediately and automatically calling the relay on the second telephoneline so that the captioning of the telephone call by the relay cancommence as soon as possible.
 7. A method as claimed in claim 6 whereineach of the telephone lines is a telephonic connection selected from thegroup consisting of a wired pair telephone land line, a cellulartelephone link, a PCS link, and an internet protocol (IP) connection. 8.A method as claimed in claim 6 wherein the captioned telephone deviceand the telephone of the assisted unit are built into a single device.9. A method of operating a captioned telephone call in which an assisteduser is connected by through a captioned telephone device which isconnected both to one telephone line to a remote user and a secondtelephone line to a relay providing captioning for the conversation, themethod comprising the steps of during the telephone conversation, thecaptioned telephone device receiving captioning for the words spoken bythe remote user from the relay and displaying the words in a visualdisplay for the assisted user; and when the telephone conversation isended, the captioned telephone device maintaining the telephoneconnection on the second telephone line to the relay to maintain the setup in case the assisted user intends to promptly make another telephonecall.
 10. A method as claimed in claim 9 wherein each of the telephonelines is a telephonic connection selected from the group consisting of atwisted pair telephone land line, a cellular telephone link, a PCS link,and an internet protocol (IP) connection.
 11. A method of operating acaptioned telephone call in which an assisted user is connected bythrough a captioned telephone device which is connected both to onetelephone line to a remote user and a second telephone line to a relayproviding captioning for the conversation, the method comprising thesteps of during the telephone conversation, the captioned telephonedevice receiving captioning for the spoken words of the remote user fromthe relay and displaying the words in a visual display for the assisteduser; and during the telephone conversation, the captioned telephonedevice using echo cancellation to cancel the voice of the assisted userfrom the second telephone line so that the relay does not hear the voiceof the assisted user, so the relay can caption all the words on thesecond telephone line without causing confusion to the assisted user.12. A method as claimed in claim 11 wherein the telephone line is atelephonic connection selected from the group consisting of a twistedpair telephone land line, a cellular telephone link, a PCS link, and aninternet protocol (IP) socket connection.
 13. A method as claimed inclaim 11 wherein the captioned telephone device and the telephone of theassisted unit are built into a single device.